Noninfectious Complications in B-Lymphopenic Common Variable Immunodeficiency.

BACKGROUND: Common variable immunodeficiency (CVID) is considered the most symptomatic type of inborn errors of immunity in humans. Along with infectious complications, which have numerous consequences, noninfectious complications are a major challenge among CVID patients. METHODS: All CVID patients registered in the national database were included in this retrospective cohort study. Patients were divided into 2 groups based on the presence of B-cell lymphopenia. Demographic characteristics, laboratory findings, noninfectious organ involvement, autoimmunity, and lymphoproliferative diseases were evaluated. RESULTS: Among 387 enrolled patients, 66.4% were diagnosed with noninfectious complications and 33.6% with isolated infectious presentations. Enteropathy, autoimmunity, and lymphoproliferative disorders were reported in 35.1%, 24.3%, and 21.4% of patients, respectively. Some complications, including autoimmunity and hepatosplenomegaly, were reported to be significantly more frequent among patients with B-cell lymphopenia. As for organ involvement, the dermatologic, endocrine, and musculoskeletal systems were predominantly affected in CVID patients with B-cell lymphopenia. Among autoimmune manifestations, the frequency of rheumatologic, hematologic, and gastrointestinal autoimmunity was reported to be higher than that of other types of autoimmunity not associated with B cell-lymphopenia. Furthermore, hematological cancers, particularly lymphoma, were the most common type of malignancy. The mortality rate was 24.5%, and respiratory failure and malignancies were the most common causes of death, with no significant differences between the 2 groups. CONCLUSIONS: Considering that some of the noninfectious complications might be associated with B-cell lymphopenia, regular patient monitoring and follow-up with proper medication (in addition to immunoglobulin replacement therapy) are highly recommended to prevent sequelae and increase patient quality of life.

Evaluation of patients with primary immunodeficiency associated with Bacille Calmette-Guerin (BCG)-vaccine-derived complications

BACKGROUND: Bacille Calmette-Guerin (BCG) vaccination has a great impact on the prevention of severe complications of tuberculosis. However, in patients with primary immunodeficiencies (PID), it can lead to severe complications such as severe combined immunodeficiency, chronic granulomatous disease, and Mendelian susceptibility to mycobacterial disease. This study highlights the demographics, clinical complications and laboratory parameters among PID patients associated with BCG vaccination side effects. METHODS: One hundred and thirty-seven PID patients with BCGosis were evaluated in this study, based on the complications following BCG vaccination. RESULTS: The mean age of the patients with BCG complications at the time of the first visit was five years. The within-group comparison of patients showed a highly significant incidence of pneumonia and hepatomegaly in severe combined immunodeficiency patients. Furthermore, the immunologic data showed an increase in the overall rates of lymphocytes such as CD3+, CD4+ and CD8 + T cells in Mendelian susceptibility to mycobacterial disease patients. The level of immunoglobulins has also increased in chronic granulomatous disease patients. CONCLUSION: The high rate of undiagnosed PIDs predisposes individuals to a high risk of severe side effects as a result of BCG vaccination, as well as infants that are less than one month of age. Therefore, there is a need for early screening and diagnosis of PIDs before exposing unknown PID status patients to BCG vaccination. The benefits of screening and early diagnosis of PID cannot be overemphasized, especially in patients with a previous family history of immunodeficiency

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Evaluation of patients with primary immunodeficiency associated with Bacille Calmette-Guerin (BCG)-vaccine-derived complications.

BACKGROUND: Bacille Calmette-Guerin (BCG) vaccination has a great impact on the prevention of severe complications of tuberculosis. However, in patients with primary immunodeficiencies (PID), it can lead to severe complications such as severe combined immunodeficiency, chronic granulomatous disease, and Mendelian susceptibility to mycobacterial disease. This study highlights the demographics, clinical complications and laboratory parameters among PID patients associated with BCG vaccination side effects. METHODS: One hundred and thirty-seven PID patients with BCGosis were evaluated in this study, based on the complications following BCG vaccination. RESULTS: The mean age of the patients with BCG complications at the time of the first visit was five years. The within-group comparison of patients showed a highly significant incidence of pneumonia and hepatomegaly in severe combined immunodeficiency patients. Furthermore, the immunologic data showed an increase in the overall rates of lymphocytes such as CD3+, CD4+ and CD8 + T cells in Mendelian susceptibility to mycobacterial disease patients. The level of immunoglobulins has also increased in chronic granulomatous disease patients. CONCLUSION: The high rate of undiagnosed PIDs predisposes individuals to a high risk of severe side effects as a result of BCG vaccination, as well as infants that are less than one month of age. Therefore, there is a need for early screening and diagnosis of PIDs before exposing unknown PID status patients to BCG vaccination. The benefits of screening and early diagnosis of PID cannot be overemphasized, especially in patients with a previous family history of immunodeficiency.